A 2.00-kg copper rod is 40.00 cm long at 23°C. If 50,000 J are transferred to the rod by heat, what is its change in length? (ccopper = 387 J/kg•°C and acopper = 17 × 10^–6/°C)
a. 0.022 cm
c. 0.055 cm
b. 0.044 cm
d. More information is needed.
B
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Define and distinguish among the terms speed, velocity, and acceleration
What will be an ideal response?
Impulse: A block of mass m = 34 kg and speed V is behind a block of mass M = 81 kg and speed of 0.50 m/s, as shown in the figure. The surface is frictionless and the blocks collide and couple. After the collision, the blocks have a common speed of 0.90 m/s. What is the magnitude of the impulse on the 34-kg block due to the collision?
A. 32 N ? s B. 14 N ? s C. 41 N ? s D. 57 N ? s E. 73 N ? s
According to Copernicus, the retrograde motion for Mars must occur
A) at inferior conjunction, when Mars laps the Earth and passes between us and the Sun. B) at superior conjunction, when Mars lies on the far side of the Sun. C) at quadrature, when Mars lies exactly 90 degrees east or west of the Sun. D) at greatest elongation, when Mars can get up to 47 degrees from the Sun. E) at opposition, when the Earth overtakes Mars and passes between Mars and the Sun.
The direction of the acceleration of an object moving in a circle at constant speed is
a. changing, but pointing in a predictable direction. b. constant and pointing in only one direction. c. constant and pointing in two directions. d. none of these